JPWO2009128151A1 - Air path switching device and heat exchange ventilator using the same - Google Patents

Abstract

In configuring the air path switching device that switches the air path in the device to the first air path and the second air path branched from the first air path, the first is substantially along the direction of the air flow in the first air path. By disposing the air path switching plate holding portion in the vicinity of the above branch point in the air passage, the first air passage is locally divided into the first sub air passage and the second sub air passage, and the air passage switching plate holding portion is provided. The air passage switching plate that is rotatably held has a second sub-air passage when the first air passage is closed while the inlet of the second air passage is closed when the first air passage is opened. The first section for closing the first ventilation path, the frame-shaped second section for opening the first sub ventilation path when the first ventilation path is opened, and the first sub ventilation when the first ventilation path is closed. By providing a third section that closes the road, it is possible to reduce the size and noise of the drive unit that rotates the air path switching plate. That.

Description

  The present invention is provided in a device including a first ventilation path and a second ventilation path branched from the first ventilation path, and the wind for switching the ventilation path in the device between the first ventilation path and the second ventilation path. The present invention relates to a path switching device and a heat exchange ventilator using the same.

  Today, air conditioning is performed by appropriately switching between heat exchange ventilation, which exchanges heat between the outside air and room air, while exchanging heat with the heat exchange element, and normal ventilation, which does not exchange heat with the heat exchange element. Heat exchange ventilators have been developed. Most of this type of heat exchange ventilator has a supply air passage that takes in outside air and blows it out through the heat exchange element, an exhaust ventilation passage that takes in indoor air and blows it out through the heat exchange element, and heat that takes in indoor air and heats it. And a bypass ventilation path that bypasses the exchange element and blows it out of the room.

  The bypass ventilation path is branched from the exhaust ventilation path on the upstream side of the heat exchange element, and an air path switching device is provided in the branching section. When performing heat exchange ventilation, the bypass air passage is closed by the air passage switching device while the exhaust air passage is opened. For this reason, the outside air taken into the supply air passage and the room air taken into the exhaust air passage pass through the heat exchange element, and heat exchange is performed between the outside air and the room air via the heat exchange element. Is called. In addition, when performing normal ventilation operation, the exhaust air passage is closed by the air passage switching device, while the bypass air passage is opened, and the indoor air taken into the bypass air passage bypasses the heat exchange element and is outdoors. Is blown out. For this reason, heat exchange between outside air and room air does not occur substantially.

  Various air path switching devices have been developed to reduce noise and improve reliability of heat exchange ventilators or reduce power costs. For example, the air path switching device described in Patent Document 1 includes a rotatable air path switching plate that switches a ventilation path divided into two ventilation paths from one to the other and from the other to the other. When the path is switched, the air path switching plate is rotated halfway by the drive unit, and then is rotated to the closed position by the wind pressure in the ventilation path, thereby reducing the size of the drive unit. As a result, heat exchange ventilation The device is designed to reduce noise.

  Moreover, in the air path switching device (damper mechanism) of the heat exchange ventilator (air conditioning ventilator) described in Patent Document 2, the air exchange path of heat exchange ventilated air and the air vent path of normally ventilated air are the same. The heat exchange ventilator is configured so as to pass through the ventilation path cover, and the number of parts is reduced by arranging a damper that is rotated by the drive to switch the air path inside the ventilation path cover. As a result, the reliability of the heat exchange ventilator is improved.

In Patent Document 3, a pair of damper blades is provided on each of the outside air inlet side and the return air port side in the portion containing the heat exchange element, and each damper blade in each pair is connected by a connecting rod. And a pair of dampers provided on the return air port side when the lower damper blades of the pair of damper blades provided on the outside air intake side are closed. A heat exchange ventilator (rotary heat exchange ventilation unit) configured such that the upper damper blade of the blades is opened is described. This heat exchange ventilator switches between heat exchange ventilation and normal ventilation (normal ventilation) by controlling the opening and closing of each pair of damper blades. During heat exchange ventilation, each of the supply and exhaust fans is operated strongly. However, during normal ventilation, each of the air supply fan and the exhaust fan is operated weakly to reduce the power cost.
JP 2000-337893 A JP-A-5-332572 Japanese Patent Laid-Open No. 2001-41524

  The conventional air path switching device is attached to a partition surface between the exhaust air ventilation path and the bypass air ventilation path, and opens and closes the exhaust air ventilation path and the bypass ventilation path by rotating one air path switching plate in a predetermined direction. The size of the air passage switching plate is selected so that both the exhaust air passage and the bypass air passage can be closed. For this reason, the space for closing of the width which can each position the said air path switching board is ensured around the inflow opening in an exhaust ventilation path, and the surroundings of an inflow opening in a bypass ventilation path, respectively.

  However, although the heat exchange element is located in the exhaust ventilation path but the heat exchange element is not located in the bypass ventilation path, the pressure loss of the indoor air flowing through the bypass ventilation path is the pressure in the exhaust ventilation path. Even if the sectional area of the bypass ventilation path is made smaller than that of the sectional machine of the exhaust ventilation path, it is possible to obtain the same amount of air flow. Securing a closing space around the inlet in the bypass ventilation path that is the same size as the closing space secured around the inlet in the exhaust ventilation path It becomes an obstructive factor in trying to reduce the size.

  In addition, since the switching of the ventilation path is performed during the operation of the heat exchange ventilator, the air path switching plate must be rotated against the wind pressure caused by the air flow when the air path is switched, and the air path switching plate is rotated. A relatively large load is applied to the driving machine. For this reason, in a wind path switching device or a large air volume heat exchange ventilator arranged in a large air flow path, a large-sized drive machine having a driving force that overcomes the wind pressure applied as a load at the time of air path switching is required. An increase in the size of the drive unit in the air path switching device leads to an increase in the size of each of the air path switching device and the heat exchange ventilator, leading to an increase in the installation space of the heat exchange ventilator. In addition, the noise reduction of the air path switching device and the heat exchange ventilator is hindered.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to obtain an air path switching device that can easily be reduced in size and noise and a heat exchange ventilator using the same.

  An air path switching device according to the present invention that achieves the above object is provided in a device including a first air passage and a second air passage branched from the first air passage, and the air passage in the device is connected to the first air passage. An air path switching device that switches between one air path and the second air path, and that is provided in the vicinity of a branch point in the first air path substantially along the direction of the air flow in the first air path And a plate-shaped first section that is rotatably held by the air path switching plate holding portion and is connected in a substantially crank shape, a frame-shaped second section having an opening, and a plate-shaped third section When selecting the first ventilation path as the ventilation path switching plate and the ventilation path, the first section closes the inlet of the second ventilation path, and the opening of the second section is the air path switching in the first ventilation path. Located in the area of the second ventilation path side of the plate holding part, the third section is the air path switching plate When the air passage switching plate is rotated so as to be located on the downstream side of the holding portion and the second air passage is selected as the air passage, the first section is more than the air passage switching plate holding portion in the first air passage. The area on the side away from the second ventilation path is closed, the opening of the second section overlaps with the air path switching plate holding part, and the third section is first in the first ventilation path than the air path switching plate holding part. And a drive mechanism for rotating the air passage switching plate so as to close the region on the side of the two air passages.

  The heat exchanging ventilator of the present invention that achieves the above object includes an air supply passage that takes in outside air and blows it into the room, a heat exchange element that is arranged in the middle of the air supply passage, and heat exchange that takes in indoor air. Exhaust ventilation path that blows outside through the element, bypass ventilation path that diverts from the exhaust ventilation path, bypasses the heat exchange element and blows the room air out of the room, and exhaust ventilation path that exhausts the indoor air flow path A heat exchange ventilator provided with an air passage switching device for switching between an air passage and a bypass air passage, the air passage switching device being in the vicinity of a branch point in the exhaust air passage substantially along the direction of the air flow in the exhaust air passage An air path switching plate holding portion disposed on the plate, a plate-shaped first section that is rotatably held by the air path switching plate holding portion and is connected in a substantially crank shape, a frame-shaped second section having an opening, And a plate-like third section When selecting an exhaust ventilation path as a ventilation path, the first section closes the inlet of the bypass ventilation path, and the opening of the second section holds the ventilation path switching board among the exhaust ventilation paths. When the bypass passage is selected as the ventilation passage by rotating the air passage switching plate so that the third section is located on the downstream side of the air passage switching plate holding portion, in the region closer to the bypass ventilation passage than the portion, The first section closes the region of the exhaust ventilation path that is further away from the bypass ventilation path than the ventilation path switching plate holding part, the opening of the second section overlaps with the ventilation path switching plate holding part, and the third section Has a drive mechanism for rotating the air passage switching plate so as to close the region on the bypass air passage side of the air passage switching plate holding portion in the exhaust air passage.

  The air passage switching device of the present invention closes the second air passage in the first section of the air passage switching plate when opening the first air passage, and closes the first air passage when closing the first air passage. Since the area on the side farther from the second ventilation path than the air path switching plate holding part is closed by the first section, the area of the inlet in the second ventilation path is the same as that of the first ventilation path. It can be reduced to the same extent as the cross-sectional area of the area farther from the second ventilation path than the air path switching plate holding part.

  Even if the cross-sectional area of the first ventilation path at the place where the air path switching plate holding part is arranged is about the same as the conventional one, the area of the inlet in the second ventilation path can be reduced. Of the switching plate, the area of the region directly related to the closing of the air passage can be made smaller than before, and the wind pressure applied to the air passage switching plate at the time of air passage switching can be reduced. Further, since the wind pressure applied to the first section or the third section can be used as a part of the driving force when the air path switching plate is rotated, the driving mechanism can be configured using a small driving machine. It becomes easy.

  Therefore, according to the present invention, it is easy to obtain a small and low-noise air path switching device. Moreover, in the heat exchange ventilator of this invention, since the air path switching device of this invention is used as an air path switching device which switches an exhaust ventilation path and a bypass ventilation path, it is easy to obtain a small and low-noise thing. The exhaust ventilation path in the heat exchange ventilator of the present invention corresponds to the first ventilation path, and the bypass ventilation path corresponds to the second ventilation path.

FIG. 1 is a partially cutout horizontal sectional view schematically showing a state during heat exchange ventilation in an example of the heat exchange ventilation apparatus of the present invention. FIG. 2 is a partially cutaway horizontal sectional view schematically showing a state during normal ventilation in the heat exchange ventilator shown in FIG. 1. FIG. 3A is a perspective view schematically showing a main part of the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG. 4A is a perspective view schematically showing an air path switching plate holding portion in the air path switching device shown in FIGS. 1 and 2, and FIG. It is a perspective view which shows roughly the air path switching board in the shown air path switching apparatus. 3-2 is another perspective view schematically showing a main part of the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG. 4-1 is a perspective view schematically showing an air path switching plate holding portion in the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG. 4-2 is a perspective view schematically showing an air path switching plate in the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG. 5A is a partially cutaway perspective view schematically showing the air passage switching device when the bypass air passage in the heat exchange ventilator shown in FIGS. 1 and 2 is closed. FIG. 5-2 is a partially cutaway plan view schematically showing the air passage switching device when the bypass air passage in the heat exchange ventilator shown in FIGS. 1 and 2 is closed. FIG. 6A is a partially cutaway perspective view schematically showing the air passage switching device when the bypass air passage in the heat exchange ventilator shown in FIGS. 1 and 2 is opened. FIG. 6B is a partially cutaway plan view schematically showing the air passage switching device when the bypass air passage in the heat exchange ventilator shown in FIGS. 1 and 2 is opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Outside air inlet 1b Outside air outlet 5a Indoor air inlet 5b Indoor air outlet 20 Housing 25 Heat exchange element 30 Supply fan 35 Exhaust fan 40 Air path switching plate holding part 50 Air path switching plate 51 First section 52 First 2 section 53 3rd section 53A 1st portion 53B 2nd portion 55 Elastic member 57 Drive unit 59 Link member 60 Air passage switching device 65 Calculation / control unit 70 Heat exchange ventilator SF Air supply air passage EF Exhaust air passage EF _1st 1 sub ventilation path EF _2nd sub ventilation path BF bypass ventilation path DM drive mechanism

  Hereinafter, embodiments of the air path switching device and the heat exchange ventilation device of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 1 is a partially cutaway horizontal sectional view schematically showing a state during heat exchange ventilation in an example of the heat exchange ventilator of the present invention, and FIG. 2 is a diagram of the heat exchange ventilator shown in FIG. It is a partial notch horizontal sectional view which shows the mode at the time of normal ventilation roughly.

  A heat exchange ventilator 70 shown in FIGS. 1 and 2 is included in the casing 20, the two heat exchange units 25 and 25, the air supply fan 30, the exhaust fan 35, and the air path switching device of the present invention. An air path switching device 60, a calculation / control unit 65 that controls the operation of the air path switching device 60, and a command input unit 67 that functions as an input device of the calculation / control unit 65 are provided.

  The housing 20 is a rectangular parallelepiped box, and the outside air inlet 1a, the outside air outlet 1b, the room air inlet 5a, and the room air outlet 5b are provided on the side wall. In addition, two horizontal partition walls 10 a and 10 b are provided in the housing 20, which are located at the center in the depth direction of the housing 20. The horizontal partition walls 10a and 10b are separated from each other at the central portion in the housing 20, and two heat exchange units 25 and 25 are arranged in parallel here.

  Each heat exchange unit 25 includes a heat exchange element 25a and a frame body 25b that accommodates the heat exchange element 25a. As the heat heat exchange element 25a, for example, a paper partition member having a sheet shape and a paper interval holding member having a corrugated shape are alternately laminated, and between the partition member and the interval holding member below it, and A cross-flow type member in which a plurality of air flow paths are formed between the partition member and the spacing member on the partition member is used. Each flow path formed below the partition member and each flow path formed above the partition member are substantially perpendicular to each other when viewed in plan, and air flows down each flow path formed below the partition member Sensible heat and latent heat are exchanged through the partition member between the air and the air flowing down each flow path formed on the partition member.

  Each heat exchange unit 25 is arranged in the housing 20 with the heat exchange element 25a lying on its side, and is fixed to the housing 20 by a pair of holder portions 29a and 29b. 1 and 2, the horizontal partition walls 10a and 10b are smudged so that the horizontal partition walls 10a and 10b and the bottom plate 20b of the housing 20 can be easily distinguished from each other.

  The outside air suction port 1a and the outside air suction outlet 1b provided in the housing 20 are divided into one side and the other side of the heat exchange unit 25 on the near side in FIGS. 1 and 2 in plan view. The outside air outlet 1b is located above the horizontal partition wall 10b. The outside air inlet 1a and the outside air outlet 1b communicate with each other through the heat exchange units 25, and constitute the air supply ventilation path SF together with the air supply fan 30 disposed on the horizontal partition wall 10b.

  Two vertical partition walls 13a, 13b are disposed in the vicinity of the outside air suction port 1a in the bottom plate 20a, and three vertical partition walls 13c, 13d, 13e in the vicinity of the air supply fan 30 in the horizontal partition wall 10b are disposed. An air supply passage SF having a shape is defined. Each vertical partition wall 13 c, 13 d, 13 e constitutes a casing of the air supply fan 30. By driving the air supply fan 30, the outside air is taken into the heat exchange ventilator 70 from the outside air suction port 1a, and the outside air passes through each heat exchange unit 25, the air supply fan 30, and the outside air outlet 1b. Is blown out. In FIG. 1 and FIG. 2, the flow of outside air in the supply air passage SF is indicated by a broken line BL.

  Further, the indoor air intake port 5a and the indoor air intake / exhaust port 5b provided in the housing 20 are, on a plan view, one side and the other side of the heat exchange unit 25 on the back side in FIG. 1 and FIG. The indoor air outlet 5b is located above the horizontal partition wall 10a. The indoor air suction port 5a and the indoor air blowing port 5b communicate with each other through the heat exchange units 25 to form an exhaust ventilation path EF together with the exhaust fan 35 disposed on the horizontal partition wall 10a. The heat exchange unit 25 is bypassed and communicated with the exhaust fan 35 to form a bypass ventilation path BF.

  Two vertical partition walls 15a and 15b are disposed in the vicinity of the indoor air suction port 5a in the bottom plate 20a, and five vertical partition walls 15c, 15d, 15e, 15f and 15g are disposed in the vicinity of the exhaust fan 35 in the horizontal partition wall 10a. Thus, an exhaust ventilation path EF having a predetermined shape is defined. The vertical partition walls 15 c, 15 d, 15 e, 15 f constitute a casing for the exhaust fan 35. Further, a bypass air passage BF having a predetermined shape is formed by the vertical partition walls 15a and 15d, the vertical partition wall 17 disposed on one end side of the heat exchange unit 25 on the back side in FIGS. Is defined. The bypass ventilation path BF is branched from the exhaust ventilation path EF in the vicinity of the indoor air suction port 5a, and the inflow port IO is provided in the vertical partition 15a.

By driving the exhaust fan 35 described above, an exhaust ventilation path EF or a bypass ventilation path BF that takes in indoor air and blows it out of the room is formed in the heat exchange ventilator 70. As shown in FIG. 1, when the inflow port IO of the bypass ventilation path BF is closed by the air path switching plate 50 of the air path switching device 60, the exhaust ventilation path EF is formed in the heat exchange ventilator 70. The indoor air taken into the heat exchange ventilator 70 from the indoor air suction port 5a reaches the exhaust fan 35 via each heat exchange unit 25, and is blown out of the room through the indoor air outlet 5b. The flow of the indoor air in the exhaust ventilation passage EF in FIG. 1 are indicated by one-dot chain line CL _1.

On the other hand, as shown in FIG. 2, when the exhaust air passage EF is closed by the air passage switching plate 50 of the air passage switching device 60, a bypass air passage BF is formed in the heat exchange ventilator 70, and the indoor air The room air taken into the heat exchange ventilator 70 from the suction port 5a bypasses each heat exchange unit 25, reaches the exhaust fan 35, and is blown out of the room through the room air outlet 5b. The flow of room air in the bypass air passage BF in FIG. 2 indicated by a two-dot chain line CL _2. As shown in FIG. 1, the exhaust ventilation path EF is divided into the first sub ventilation path EF ₁ close to the bypass ventilation path BF and the second sub ventilation path EF ₂ far from the bypass ventilation path BF by the air path switching device 60. And are divided locally.

  The calculation / control unit 65 determines which of the exhaust ventilation path EF and the bypass ventilation path BF is formed. The calculation / control unit 65 detects a detection result of a temperature sensor (not shown) arranged in the vicinity of the outside air inlet 1a and a detection of a temperature sensor (not shown) arranged in the vicinity of the indoor air inlet 5a. Based on the result, it is determined whether heat exchange ventilation is appropriate or normal ventilation is appropriate, and the operation of the air path switching device 60 is controlled based on the determination result. When it is determined that heat exchange ventilation is appropriate, the air path switching device 60 is operated to close the inlet IO of the bypass ventilation path BF, and when it is determined that normal ventilation is appropriate, the air path The switching device 60 is operated to close the exhaust ventilation path EF.

  Since the heat exchange ventilator 70 having the above-described configuration is characterized by the air path switching device 60, hereinafter, the reference numerals used in FIG. 1 or FIG. The air path switching device 60 will be described in detail with reference to -2.

  FIG. 3A is a perspective view schematically showing a main part of the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2, and FIG. It is another perspective view which shows roughly the principal part in the air path switching apparatus used for the heat exchange ventilator shown in FIG. 4A is a perspective view schematically showing an air path switching plate holding portion in the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG. 2 is a perspective view schematically showing an air path switching plate in the air path switching device used in the heat exchange ventilator shown in FIGS. 1 and 2. FIG.

  As shown in FIGS. 3A and 3B, the air path switching device 60 includes an air path switching plate holding unit 40 and an air path switching plate that is rotatably held by the air path switching plate holding unit 40. 50 and a drive mechanism which will be described later. FIGS. 3A and 3B show an elastic member 55 constituting the drive mechanism.

  As shown in FIGS. 3-1, 3-2, and 4-1, the air path switching plate holding unit 40 is fixed to the bottom plate 20b of the housing 20 (see FIGS. 1 and 2). The base portion 41 and the top plate portion 45 are connected to the back plate portion 43. Through holes 41 a and 41 a into which fixing tools such as screws are inserted are formed at both ends in the longitudinal direction of the base portion 41, and an elastic member 55 such as a spring is formed on the lower side portion of the back plate portion 43. An engaging portion 43a to which one end of each is connected is formed. Further, the base portion 41 is formed with a through hole 41b to which one end of a rotating shaft 47 (see FIG. 4-1) that rotatably holds the air path switching plate holding portion 40 is mounted. In 45, a through hole 45a to which the other end of the rotary shaft 47 is mounted is formed.

On the other hand, as shown in FIGS. 3-1, 3-2, and 4-2, the air passage switching plate 50 includes first to third sections 51 to 53 connected in a substantially crank shape. The first section 51 contacts the vertical partition 15a when the exhaust ventilation path EF is opened, closes the inlet IO (see FIGS. 1 and 2) of the bypass ventilation path BF, and closes the exhaust ventilation path EF. When this occurs, the inlet of the second sub-air passage EF ₂ (see FIG. 1) is closed.

The second section 52 has a frame shape and is connected to the first section 51 at a predetermined angle with the first section 51. When the exhaust ventilation path EF is opened, the first sub ventilation path EF ₁ ( 1) is opened. Flange 52a, 52b is provided in the lower end and upper end of the height direction in this 2nd section 52, and when opening exhaust ventilation path EF, the opening part 52c in the said 2nd section 52 is the 1st sub ventilation. It becomes part of the road-EF _1.

The third section 53 is connected to the second section 52 at a predetermined angle with the second section 52, and is located on the downstream side of the air passage switching plate holding portion 40 when the exhaust air passage EF is opened. When the path EF is closed, the first sub ventilation path EF ₁ (see FIG. 1) is closed. The third section 53 includes a first portion 53A connected to the second section 52 and a second portion 53B connected to the first portion 53A.

  Flange 53a, 53b is provided in the lower end and upper end of the height direction in the 1st portion 53A, and the above-mentioned rotating shaft 47 (refer to Drawing 4-1) is inserted in each flange 53a, 53b. A hole 53c is formed. The first portion 53 </ b> A is pivotally attached to the air path switching plate holding unit 40 by the rotation shaft 47. Further, the first portion 53A has two attachment holes 53d and 53d to which the other end of the elastic member 55 such as a spring is connected, and two attachment holes 53e and 53e (to which one end of a link member described later is connected). (See FIG. 4-2).

On the other hand, the second portion 53B in the third section 53 is connected to the first portion 53A at a predetermined angle with the first portion 53A, and the first subportion 53A is closed together with the first portion 53A when the exhaust passage EF is closed. Ventilation path EF ₁ (see FIG. 1) is closed. The area of the second portion 53 </ b> B is smaller than the area of the first section 51.

  The air path switching device 60 including the air path switching plate holding unit 40 and the air path switching plate 50 described above operates under the control of the calculation / control unit 65 (see FIG. 1 or FIG. 2), and will be described later. The air path switching plate 50 is rotated in a predetermined direction by the driving force applied from the above, and the indoor air flow path is selected from the bypass ventilation path BF and the exhaust ventilation path EF. Hereinafter, the arrangement and operation of the air path switching device 60 will be described in detail with reference to FIGS.

  FIG. 5A is a partially cutaway perspective view schematically showing the air path switching device when the bypass ventilation path is closed, and FIG. 5-2 is the air path switching when the bypass ventilation path is closed. It is a partial notch top view which shows an apparatus roughly. FIG. 6A is a partially cutaway perspective view schematically showing the air path switching device when the bypass ventilation path is opened, and FIG. 6-2 shows the wind when the bypass ventilation path is opened. It is a partial notch top view which shows a path switching apparatus roughly.

As shown in FIGS. 5A and 5B, the air path switching plate holding unit 40 in the air path switching device 60 is bypassed in the exhaust ventilation path EF substantially along the direction of the air flow in the exhaust ventilation path EF. It is arranged near the branch point with the ventilation path BF, specifically downstream of the branch point. As a result, the exhaust ventilation path EF extends from the first sub ventilation path EF ₁ , which is a region closer to the bypass ventilation path BF than the air path switching plate holding unit 40, and from the bypass ventilation path BF than the air path switching plate holding unit 40. It is divided locally into a second sub-air passage EF ₂ which is a region on the far side.

The air path switching plate 50 is rotatably held by the air path switching plate holding portion 40, and when the exhaust ventilation path EF is selected as the ventilation path, the driving member 57 such as the elastic member 55 and the geared motor described above. And a driving force from a driving mechanism DM having a link member 59 such as a connecting rod for connecting the driving device 57 and the third section 53 to rotate in the arrow A direction. As a result, the first section 51 has an inlet IO of the bypass air-passage channel BF closed, the opening 52c of the second section 52 is positioned in the first sub-air-passage channel EF _1, switching the third section 53 is the air passage-plate It will be located downstream of the holding part 40. Since the indoor air that has flowed into the first sub-air passage EF ₁ flows down the opening 52c of the second section 52, the first sub-air passage EF ₁ is not closed.

  When the exhaust ventilation path EF is selected, the drive unit 57 is in a stopped state, but the elastic member 55 (see FIG. 5-2) pulls the third section 53 toward the air path switching plate holding unit 40 by its elastic force. Therefore, the air path switching plate 50 rotates in the arrow A direction. That is, the air path switching plate 50 rotates in the direction of the arrow A by the elastic force of the elastic member 55 without applying a driving force from the driving device 57 to the air path switching plate 50.

On the other hand, as shown in FIGS. 6A and 6B, when the bypass ventilation path BF is selected as the ventilation path, the air path switching plate 50 is rotated in the arrow B direction by the driving force from the drive mechanism DM. . As a result, the second sub-air-passage channel EF ₂ are closed by the distal end portion of the first section 51 is in close contact with the vertical partition wall 15b, the openings 52c of the second section 52 overlaps the air passage switching plate holding portion 40, the third The section 53 closes the first sub ventilation path EF ₁ .

When the bypass ventilation path BF is selected, the drive unit 57 operates to draw the link member 59 toward the drive unit 57 against the elastic force of the elastic member 55 (see FIG. 6B). Therefore, a tensile force is applied from the driving device 57 to the ventilation path switching plate 50 via the link member 59, the third section 53 is drawn toward the driving device 57, and the air path switching plate 50 rotates in the direction of arrow B. To do. At this time, since the opening portion 52c of the second section 52 (e.g., see FIG. 5-1) is substantially overlaps with ventilation path holding unit 40, the pressure loss in the first sub-air-passage channel EF ₁ is suppressed.

  When the air path switching plate 50 rotates, wind pressure is applied to each of the first section 51 and the third section 53. However, since the area of the first section 51 is larger than the area of the second portion 53B in the third section 53, when the air path switching plate 50 rotates to some extent in the direction of arrow B from the vertical partition wall 15a side, The wind pressure applied to the back surface of the section 51 (the surface located on the inlet IO side of the bypass ventilation path BF) becomes larger than the wind pressure applied to the second portion 53B, so that the air path switching plate 50 naturally becomes the arrow B. Rotate in the direction. For this reason, even if the drive machine 57 is reduced in size, it is possible to rotate the air path switching plate 50 in the arrow B direction.

  Although not shown, the housing 20 of the heat exchange ventilator 70 has a lid with a predetermined shape, and the upper end of the air path switching plate holder 40 is in close contact with the lower surface of the lid. When opening the convex part, the convex part where the upper end portion of the first section 51 is in close contact with the heat exchange unit 25 (see FIG. 1 or FIG. 2) when opening the bypass ventilation path BF, and opening the bypass ventilation path BF Further, a convex portion is formed in which the upper end portion of the third section 53 (excluding the region covered by the air path switching plate holding portion 40) is in close contact with the indoor air suction port 5a side. When opening the bypass ventilation path BF, the exhaust ventilation path EF is closed by the three convex portions formed on the lower surface of the lid portion, the first section 51 and the third section 53.

As described above, the air path switching device 60 locally divides the exhaust ventilation path EF into the first sub ventilation path EF ₁ and the second sub ventilation path EF ₂ by the air path switching plate holding unit 40, and the exhaust ventilation path. When opening the EF, the inlet section IO of the bypass ventilation path BF is closed in the first section 51 of the air path switching plate 50, and when closing the exhaust ventilation path EF, the second sub ventilation path EF is closed in the first section 51. since ₂ closed, it is possible to reduce the area of the inlet port IO of the bypass air-passage channel BF to the second same extent as the area of the sub-air-passage channel EF _2.

Even if the cross-sectional area of the exhaust ventilation path EF at the portion that is locally divided into the first sub ventilation path EF ₁ and the second sub ventilation path EF ₂ is made the same as the conventional one, the inlet IO in the bypass ventilation path BF Since the area of the air path switching plate 50 directly related to the closing of the air path can be reduced, the wind pressure applied to the air path switching plate 50 during the air path switching can be reduced. be able to. Further, since the wind pressure applied to the first section 51 or the third section 53 can be used as part of the driving force when the air path switching plate 50 is rotated, it is easy to reduce the size of the driving device 57. is there. Therefore, the air path switching device 60 can be easily reduced in size and noise, and the heat exchange ventilator 70 using the air path switching device 60 can be easily reduced in size and noise.

  As described above, the airway switching device and the heat exchange ventilator according to the present invention have been described with reference to the embodiment. However, as described above, the present invention is not limited to the above-described embodiment. Even if the shape of the air path switching plate holding part in the air path switching device, the number of sections in the air path switching plate, and the shape of each section are variously changed, the functions similar to those of the air path switching device described in the embodiment are provided. Can be obtained.

  For example, in the air path switching device described in the embodiment, the third section on the air path switching plate is divided into the first portion and the second portion, but the third section can be configured by one portion. It can also consist of three or more potions.

  Further, the configuration other than the air path switching device in the heat exchange ventilator can be appropriately changed as long as the bypass air path branches from the exhaust air path. Each of the air path switching device and the heat exchange ventilation device of the present invention can be variously modified, modified, combined, and the like.

  The air path switching device of the present invention can be applied to various devices including a first air path and a second air path branched from the first air path. Moreover, the heat exchange ventilator of the present invention can be used as a home or business heat exchange ventilator that performs heat exchange ventilation and normal ventilation.

Claims (4)

An air path that is provided in a device having a first air passage and a second air passage branched from the first air passage, and switches the air passage in the device between the first air passage and the second air passage. A switching device,
An air path switching plate holding portion disposed in the vicinity of the branch point in the first air path substantially along the direction of the air flow in the first air path;
An air passage having a plate-like first section which is rotatably held by the air passage switching plate holding portion and connected in a substantially crank shape, a frame-shaped second section having an opening, and a plate-like third section. A switching plate;
When the first ventilation path is selected as the ventilation path, the first section closes the inlet of the second ventilation path, and the opening of the second section is the air path in the first ventilation path. The air passage switching plate is rotated so that the air passage switching plate is located in a region closer to the second air passage than the switching plate holding portion, and the third section is located downstream of the air passage switching plate holding portion. When selecting the second ventilation path, the first section closes a region of the first ventilation path on the side farther from the second ventilation path than the air path switching plate holding portion, and the second ventilation path is closed. The opening of the section overlaps with the air passage switching plate holding portion, and the third section closes the region of the first air passage closer to the second air passage than the air passage switching plate holding portion. A driving mechanism for rotating the air path switching plate;
An air path switching device characterized by comprising: The drive mechanism is
One end is connected to the air path switching plate holding portion, the other end is connected to the third section, and the air path switching plate is rotated in a direction to close the first air passage. An elastic member for urging the path switching plate in the opposite direction;
A drive unit that is connected to the third section and applies a tensile force to the air passage switching plate when the second air passage is selected as the air passage;
The air path switching device according to claim 1, comprising: An air supply passage that takes in outside air and blows it out into the room, a heat exchange element that is arranged in the middle of the air supply passage, an exhaust air passage that takes in room air and blows it out through the heat exchange element, and the exhaust A bypass ventilation path that branches off from the ventilation path and blows the room air out of the room by bypassing the heat exchange element; and the exhaust ventilation path and the bypass ventilation path provided in the exhaust ventilation path. A heat exchange ventilator equipped with an air path switching device for switching between
The air path switching device is
An air path switching plate holding part disposed in the vicinity of the branch point in the exhaust air path substantially along the direction of the air flow in the exhaust air path;
An air passage having a plate-like first section which is rotatably held by the air passage switching plate holding portion and connected in a substantially crank shape, a frame-shaped second section having an opening, and a plate-like third section. A switching plate;
When the exhaust ventilation path is selected as the ventilation path, the first section closes the inlet of the bypass ventilation path, and the opening of the second section holds the air path switching plate in the exhaust ventilation path. It is located in the region closer to the bypass air passage than the part, and the air passage switching plate is rotated so that the third section is located downstream of the air passage switching plate holding portion, and the bypass air passage is used as the air passage. Is selected, the first section closes a region of the exhaust ventilation path that is further away from the bypass ventilation path than the air path switching plate holding part, and the opening of the second section is The air passage switching plate is overlapped with the air passage switching plate holding portion, and the air passage switching plate is rotated so that the third section closes the bypass air passage side region of the exhaust air passage with respect to the air passage switching plate holding portion. The And a drive mechanism that,
A heat exchange ventilator characterized by comprising: The drive mechanism is
One end is connected to the air path switching plate holding part, the other end is connected to the third section, and the air path is turned when the air path switching plate is rotated in a direction to close the exhaust ventilation path. An elastic member for urging the switching plate in the opposite direction;
A drive unit that is connected to the third section and applies a tensile force to the air passage switching plate when the bypass air passage is selected as the air passage;
The heat exchange ventilator according to claim 3, wherein

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